Jan:
Thanks for the kind words. Where in the world are you now

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rrankin///M5:
Glad to see you finally got your SES lights all settled out. As far as the tires, I have run the Kumho's on my previous 540/6 and was not that impressed with them. The price is great for them, but I found them to offer very little feedback especially when on the limit before giving out totally. I also found that they were terrible in the wet after about 10k miles. I would look into other brands if possible such as Bridgestone S03 and Michelin PS2. If you have any questions feel free to give me a call, as I have the wholesale accounts with tirerack and others and can get you more info with pricing and technical specs about each tire.
As far as detailing, feel free to give me a call. As Jan stated, I deal mostly with Zymol products but am pretty familiar with the M5 (probably done about 30+ details on them). Feel free to give me a call,pm, or email if you have any questions.